Muslims do not celebrate Christmas because they do not believe in the birth of Jesus Christ as the Son of God. Christmas is a Christian holiday that celebrates the birth of Jesus Christ, who is considered the Messiah and the Son of God by Christians. Muslims believe in the prophet Muhammad and the Quran as the final revelation of God's word, but they do not believe in the divinity of Jesus Christ. Therefore, they do not celebrate his birth as a holiday. However, some Muslims may still participate in Christmas celebrations as a cultural or secular event.